It does nothing for MPG, since 5w20 and 0w20 are the same viscosity at normal operating temp. It does provide lower viscosity on startup. That's the reason for the change.
The "0w" is for the cold viscosity, "20" is for normal op temp.

It does nothing for MPG, since 5w20 and 0w20 are the same viscosity at normal operating temp. It does provide lower viscosity on startup. That's the reason for the change.
The "0w" is for the cold viscosity, "20" is for normal op temp.

well i do a lot of really short trips, so that's probably why i've seen some difference.

lol well actually im pretty lucky. most people have to deal with the insane traffic. the distances are short but during traffic it'll take like an hour and a half to go to some of the suburbs that are like only 20 miles away haha

I am pretty sure the use of the thinner (operating temp numbers) is to try and eake out all of the MPG's they can from the factory due to meeting tighter and tighter mileage requirements. I use Rotella T6 5w-40, and it has been a great oil. I have read some research items that showed the thinner oils have performed "as well as" thicker oils, but I still feel that having a thicker oil (when running not when cold) will protect a bit more. There really is no way to tell if it is working the way it should outside of sending the oil out to a lab for testing. I would say that you are not hurting anything but I still think thicker oil will protect better. But thats just me...

I am pretty sure the use of the thinner (operating temp numbers) is to try and eake out all of the MPG's they can from the factory due to meeting tighter and tighter mileage requirements. I use Rotella T6 5w-40, and it has been a great oil. I have read some research items that showed the thinner oils have performed "as well as" thicker oils, but I still feel that having a thicker oil (when running not when cold) will protect a bit more. There really is no way to tell if it is working the way it should outside of sending the oil out to a lab for testing. I would say that you are not hurting anything but I still think thicker oil will protect better. But thats just me...

Maybe I missed something but it does not mention exclusivity to 4cyl. It seems to apply to both 4 and 6cyl.

Depends on what Toyota official source you're looking at. Or you could email them a question, and get another answer.

When the TSB notification came out, discussion with the dealer was confusing, so I called Toyota and asked if I could switch to the thinner synth oil and move to a 10k mile change interval. The answer was no, my v6 Tacoma still requires 5w30 and a 5k mile change interval, whether it is synthetic or not.

2011 is the same engine, no known changes internally, so I would assume the answer still applies.

Companies make decision changes all the time. I like how folks refer back to the manual all the time and say that is what to go by even when the manufacture says to change. I think if you are under warranty both would be covered since both are mentioned in some documentation that Toyota provides. You could print out the website and put in your manual if you want to use the 0w-30.